next()方法当一个文件被用作迭代器，典型例子是在一个循环中被使用，next()方法被反复调用。此方法返回下一个输入行，或引发StopIteration异常EOF时被命中。

与其它文件的方法，如ReadLine()相结合next()方法工作不正常。然而，usingseek()将文件重新定位到一个绝对位置将刷新预读缓冲器。

语法

以下是next()方法的语法：

fileObject.next();

参数

NA

返回值

此方法返回下一个输入行。

例子

下面的示例演示next()方法的使用。

#!/usr/bin/python # Open a file fo = open("foo.txt", "rw+") print "Name of the file: ", fo.name # Assuming file has following 5 lines # This is 1st line # This is 2nd line # This is 3rd line # This is 4th line # This is 5th line for index in range(5): line = fo.next() print "Line No %d - %s" % (index, line) # Close opend file fo.close()

当我们运行上面的程序，它会产生以下结果：

Name of the file: foo.txt Line No 0 - This is 1st line Line No 1 - This is 2nd line Line No 2 - This is 3rd line Line No 3 - This is 4th line Line No 4 - This is 5th line